Which of the following extends the life of equipment?
Preventative Maintenance
Which of the following is an example of PM?
Scheduled Service
Exercising water systems valves is an example of which type of maintenance?
Preventative Maintenance
How often should a plant exercise the valves in its system?
At least once a year
Which type of gate valve do you bury?
Non-Rising Stem
Which of the following is the most common type of valve used in water systems?
Gate Valves
Which of the following valves is used to control the rate of flow?
Globe Valve (Also, Butterfly, Eccentric, and Plug)
Which of the following valves is used to start or stop flows?
Gate Valve
Using a gate valve to control flow may cause what problem?
Undue Seat Wear
Opening and closing a valve rapidly will cause?
Water Hammer
What does it take to fully open a plug, eccentric or butterfly valve?
One Quarter Turn (1/4)
Which of the following pumps is most often used for delivering chemicals?
Positive Displacement
Which of the following pumps is widely used in water systems?
Centrifugal Pump
How do you keep a centrifugal pump primed?
Install a Foot or Check Valve
What is the recommended maximum suction lift?
15'
The formation and collapse of a gas pocket or air bubbles on the blade of an impeller or gate valve is called?
Cavitation
The sound of marbles in a pump is called?
Cavitation
Loud noises in a pump that sound like someone is hitting the impeller with a hammer are called?
Cavitation
What is the purpose of the lantern ring?
Water Seal
The seal water pressure should be?
Five (5) PSI higher than pump discharge PSI
What is Brinelling?
A type of bearing failure
What is a multi-stage pump?
Pump with more than one (1) impeller
What do you call a metal plate that is on equipment and lists critical operating criteria for the equipment?
Nameplate
What is the most common cause of vibration between a pump and a motor?
Misalignment of the couplings
What tool do you use to align the couplings?
Dial Indicator; Caliper
When an impeller is running backwards, what action must you take?
Switch any two leads
What is the purpose of a wear ring?
Plug Internal Leakage
Where is the wear ring located?
Between the impeller and the casing
Before working on a motor, what must you do?
Lockout and Tag
How do you install packing for a pump?
One strip at a time and staggered
When suitable for the process, mechanical seals are preferred over packing
because?
Less labor intensive
When should you adjust the packing of a pump?
When the pump is running
When half the mechanical seal is bad, what must you do?
Replace the whole seal
How do you replace a mechanical seal?
You must take the whole pump apart
Before starting a pump that has mechanical seals, what must you verify?
Make sure the seal is submersed in water
Which of the following is not a reason for a motor failure?
Pump not connected to motor
Besides a plant logbook, what other record must be kept?
Maintenance Record
What is the purpose of a limit switch?
Limits the travel of a chain or belt
What is the purpose of a shear pin?
Protect equipment from damage - Breaks/gives before damage can occur.
At the end of a suction or in-take line there is generally a?
Screen to prevent debris from getting in
When should you lubricate a pump?
The horizontal section of a suction pipe should?
Slope upward to the pump
What is the purpose of sloping the pipe upward?
Prevent air pockets
Seventy-five percent (75%) of centrifugal pump problems can be attributed to?
Suction Side
Suction piping should be a minimum of one size ________ than the pump suction/inlet nozzle.
Larger
Pumps should be operated at or near their __________ ?
Rated Heads
What is the most common reason for a pump's failure to deliver at its rated
capacity?
Air Leak
What causes the most damage to an impeller?
Air
Never operate a positive displacement pump against a?
Closed discharge valve
When lubricating a bearing, you must first?
Open the drain plug from the bearing housing
Changing and flushing oil on equipment should be performed according to manufacturer's specs and?
At least every 600 hours/3 months
What is the first thing you should do when working on equipment that you aren't familiar with?
Read Manufacturer's manual and/or call manufacturer
When a plant process has more than one pump, how you should operate the pumps?
Alternately
Before starting a pump for the first time, you should?
Lubricate it
Which of the following is a daily maintenance task for an air compressor?
Drain the air receiver (tank)
What is the major difference in the modern gate valves and the older styles?
Ans. You can repair them in place
Ans. Modern gate valves can
control flows
What is used to measure current?
Ampere
What term is used to measure resistance?
Ohms